bsls_ident.t.cpp: included cstdio, removed iostream, replace cout with printf

The bsl package group is a low level package group which needs to be tested with minimal test dependencies which defines its "level."   Examined 11 sample files for usage of cout and found only one file with multiple instances of cout.  In that file, we replaced multiple cout uses with the corresponding printf/fprintf/putchar function calls.


* included <cstdio>
* removed <iostream>
* replaced cout with printf in aSsErT macro
* replace cout with printf in LOOP_ASSERT macro
* replace cout with printf in LOOP2_ASSERT macro
* replace cout with printf in LOOP3_ASSERT macro
* replace cout with printf in LOOP4_ASSERT macro
* replace cout with printf in LOOP5_ASSERT macro
* replace cout with printf in LOOP6_ASSERT macro
* replace cout with printf in Q() macro
* replace cout with printf in P() macro
* replace cout with printf in P_() macro
* replace cout with printf in L_ macro
* replace cout with putchar in T_ macro
* replace cout with printf for main TEST CASE Banner
* replace cout with printf in Test Case Banners
* replace cout with printf in if (verbose)
* replace cerr with fprintf in default Case
* replace cerr with fprintf in testStatus check